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Best Approach To Map Enums to Functions in Python

There are several approaches you can take to map enums to functions in Python. Here are the 3 different ways to do it.

1. Dictionary to Map Enum to the Functions in Python

Using a dictionary: You can use a dictionary to map the values of the enum to the functions you want to call. For example:

In [1]:
from enum import Enum

class Operation(Enum):
    ADD = 1
    SUBTRACT = 2
    MULTIPLY = 3
    DIVIDE = 4

def add(a, b):
    return a + b

def subtract(a, b):
    return a - b

def multiply(a, b):
    return a * b

def divide(a, b):
    return a / b

operation_map = {
    Operation.ADD: add,
    Operation.SUBTRACT: subtract,
    Operation.MULTIPLY: multiply,
    Operation.DIVIDE: divide
}

def calculate(operation, a, b):
    return operation_map[operation](a, b)

result = calculate(Operation.ADD, 2, 3)
print(result)  # Output: 5
5

2. Using List to Map Enum Value to the functions in Python

Using a list or an array: You can also use a list or an array to store the functions, and use the enum value as an index to access the appropriate function. For example:

In [2]:
from enum import Enum

class Operation(Enum):
    ADD = 0
    SUBTRACT = 1
    MULTIPLY = 2
    DIVIDE = 3

def add(a, b):
    return a + b

def subtract(a, b):
    return a - b

def multiply(a, b):
    return a * b

def divide(a, b):
    return a / b

operation_list = [add, subtract, multiply, divide]

def calculate(operation, a, b):
    return operation_list[operation](a, b)

result = calculate(Operation.ADD.value, 2, 3)
print(result)  # Output: 5
5

Function Decorator As Enum Value in Python

Using a function decorator: You can define a function decorator that takes an enum value as an argument, and registers the decorated function with the corresponding enum value. Here's an example:

In [3]:
from enum import Enum

class Operation(Enum):
    ADD = 1
    SUBTRACT = 2
    MULTIPLY = 3
    DIVIDE = 4

operation_map = {}

def register_operation(operation):
    def decorator(func):
        operation_map[operation] = func
        return func
    return decorator

@register_operation(Operation.ADD)
def add(a, b):
    return a + b

@register_operation(Operation.SUBTRACT)
def subtract(a, b):
    return a - b

@register_operation(Operation.MULTIPLY)
def multiply(a, b):
    return a * b

@register_operation(Operation.DIVIDE)
def divide(a, b):
    return a / b

def calculate(operation, a, b):
    return operation_map[operation](a, b)

result = calculate(Operation.ADD, 2, 3)
print(result)  # Output: 5
5

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